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2 years ago

Domino's Pizza cuts their Large pizza into 8 equal slices. What is the area of one of the slices if diameter is 16 inches?

Mathematics

2 answers:

Amiraneli [1.4K]2 years ago

8 0

Answer:

24.96 inches²

Step-by-step explanation:

Area of full pizza:

A= π×16²/4

Number of slices is 8 equal

Area of each slice is:

A= 1/8×A

A=1/8×π×16²/4

A=0.3925×64

A=24.96

Ksju [112]2 years ago

6 0

Answer:

25.1325

Step-by-step explanation:

16/2= radius of 8. pi*r^2 for 8 is 201.06. 201.06/8(slices) = 25.1325

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3 years ago

If we wanted to create a new 90% confidence interval from a different sample for the proportion of those with a two on one date

slava [35]

Answer: 271

Step-by-step explanation:

The formula we use to find the sample size is given by :-

$n=p(1-p)(\dfrac{z_{\alpha/2}}{E})^2$

, where $z_{\alpha/2}$ is the two-tailed z-value for significance level of $(\alpha)$

p = prior estimation of the proportion

E = Margin of error.

If prior estimation of the proportion is unknown, then we take p= 0.5 , the formula becomes

$n=0.5(1-0.5)(\dfrac{z_{\alpha/2}}{E})^2$

$n=0.25(\dfrac{z_{\alpha/2}}{E})^2$

Given : Margin of error : E= 0.05

Confidence level = 90%

Significance level $\alpha=1-0.90=0.10$

Using z-value table , Two-tailed z-value for significance level of $0.10$

$z_{\alpha/2}=1.645$

Then, the required sample size would be :

$n=0.25(\dfrac{1.645}{0.05})^2$

Simplify,

$n=270.6025\approx271$

Hence, the required minimum sample size =271

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3 years ago